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Random.php
57 lines
| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * This file is part of the Nette Framework (https://nette.org) |
| 5 | * Copyright (c) 2004 David Grudl (https://davidgrudl.com) |
| 6 | */ |
| 7 | |
| 8 | namespace FapiMember\Utils; |
| 9 | |
| 10 | use InvalidArgumentException; |
| 11 | |
| 12 | /** |
| 13 | * Secure random string generator. |
| 14 | */ |
| 15 | final class Random { |
| 16 | |
| 17 | |
| 18 | /** |
| 19 | * Generates a random string of given length from characters specified in second argument. |
| 20 | * Supports intervals, such as `0-9` or `A-Z`. |
| 21 | * |
| 22 | * @param int $length |
| 23 | * @param string $charlist |
| 24 | * @return string |
| 25 | */ |
| 26 | public static function generate( $length = 10, $charlist = '0-9a-z' ) { |
| 27 | $charlist = count_chars( |
| 28 | preg_replace_callback( |
| 29 | '#.-.#', |
| 30 | static function ( array $m ) { |
| 31 | return implode( '', range( $m[0][0], $m[0][2] ) ); |
| 32 | }, |
| 33 | $charlist |
| 34 | ), |
| 35 | 3 |
| 36 | ); |
| 37 | |
| 38 | $chLen = strlen( $charlist ); |
| 39 | |
| 40 | if ( $length < 1 ) { |
| 41 | throw new InvalidArgumentException( 'Length must be greater than zero.' ); |
| 42 | } |
| 43 | |
| 44 | if ( $chLen < 2 ) { |
| 45 | throw new InvalidArgumentException( 'Character list must contain at least two chars.' ); |
| 46 | } |
| 47 | |
| 48 | $res = ''; |
| 49 | for ( $i = 0; $i < $length; $i++ ) { |
| 50 | $res .= $charlist[ random_int( 0, $chLen - 1 ) ]; |
| 51 | } |
| 52 | |
| 53 | return $res; |
| 54 | } |
| 55 | |
| 56 | } |
| 57 |